This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | -147630 |
| 7 | 23974093353 |
| 8 | -3858153003126520 |
| 9 | 621401842151984058606 |
| 10 | -100076766678577032638496300 |
| 11 | 16117472448301015835209097979510 |
| 12 | -2595734922068255016665440444288632600 |